Harp swivel



Oct. 18, 1938. l K. BERGER HARP SWIVEL Filed March 5, `1938 INVBNTOR. [faz/tel Eager;

Patented Oct. 18, 1938 UNITED STATES Parri:NT

f 2,133,913 naar swrvai. y Kernel Berger, Brooklyn, N. AY. A Apputation March 5, 193s, semi No. 194,031,

4 claims. (ci. 24o-14s);

The invention herein disclosed relates to shade supports and particularly to swivel mountings.

Objects of the invention are to provide a swivel mounting which will hold the shade in desired position on the harp and which at the same time can be readily shifted for purposes of adjustment and further to provide such a fixture in a. relatively inexpensive, readily Amanufactured and assembled form of construction.

Additional objects and novel featuresof the construction by which such objects are attained are set forth and will appear in the course of the yfollowing specification.

The drawing accompanying and forming part of the specification illustrates various practical embodiments of the invention, but it will be appreciated that structure may be modified and changed all within the true intent and broad scope of the invention as hereinafter defined and claimed. v

Fig. 1 is a broken elevation of a lamp with a lamp shade frame having a swivel of the present invention mounted thereon, the shade being indicated in broken lines. Fig. 2 is a broken side-elevation of the fixture on an enlarged scale. 4

Fig. 3 is av side view of the .fixture viewed at right angles to Fig. 2 and with the harp frame shown in section.

Fig. 4 is a bottom plan view with the wire of the harp frame broken away.

Fig. 5.is a broken sectional view as on substantially the plane of line 5 5 of Fig. 4.

Fig. 6 is a broken part sectional detail view of swivel a modified form of the invention.

Fig. '7 is a broken side view illustrating a further modified form of the invention.

In the general view, Fig. 1, a lamp is indicated at 2li, provided with a harp frame 2|, carrying the the cap and having an extended base portion 26,

in engagement with the frame, these twomembers being yieldingly thrust apart by'a spring washer 21, interposed between the base of the stud and the bottom of the cap to thereby apply yielding frictional engagement toopposite sides of the frame.

The base or lower head portion of the stud is *provides a three point elements veffect of the stud shown as vcross-grooved at28,tofit the rounded. surface of the wire in either one of twopositions.

This grooving provides additional surface for frictional engagement with the wire and also 4 holds the stud against any possible rotation when'y 5 the .finial `nut 29, Fig. 1,- is turneddown tightly over the upper threaded shank of the stud.

'I.'he spring washer 21, may be an ordinari/.split spring washer having sufcient spread `arid tenl sion to hold the lower end of the stud firmly en- Y gaged with the wire andthe lower encirclingportions of thecap Alugs 24,

y Fig. 3, firmly engaged with the opposite lower` side of thefwire.` This frictional engagement, wlth the stud bearing on the wire at aninter- `-mediate vpoint between the twospaced cap lugs and results in a firm stable mounting of theffixture on theharp and oneswhich at the same time. permits the fixture to be easilyfrocked transversely-over thewire. Because of suchstability,

this xture is well adapted toA support a .larger I and heavier form.` of shade than has. heretofore beenxconsidered practicable.: ,l i

In some cases, where it may beconsidered desirableto locky the swivel flttingin its position of adjustmentithe wireconstitutingthe harp may be roughened, toothed or ribbed 30, Fig. 6, and, further, ifconsidered desirable, either one, or both '.orI all of the wire engaging be correspondingly v roughened or toothed. Thus maybetoothed or simi-r larly fashioned as at 3|, to match the roughened part of the wire andthe grooves inthe flange or head 26, of the stud be toothed or roughened as indicated at 32. Also, in a construction of this sort, the wire may be left smooth and the biting or cap lug or lugsbe relied as in Fig. 6, one or both of the perforated cap lugs 24,

as indicated at upon to secure the "swivel against unintended angular movement on the frame. In such forms ofthe invention -where the engagement is something more than a purely frictional one, a lighter form of tensioning spring may be employed such as .is indicated at 21a. Such a lighterv form of spring is in fact desirable whenfull mechanical interlock between both members of the swivel and the wireis used as in Fig. 6, so thatthe holding effect may be relieved vto some extent by pressing down on `the cap when it is desired to effect an adjustment of the fixture. The interfitting teeth can be made quite fine and small, so that these adjustments will be practicable, the teeth in the illustration being possibly somewhat exaggerated in size for clarity. of illustrat on.

The cap with its extended lugs, forms in effect a yoke engaging the supporting frame at separated points, with the shade supporting stud substantially at the center of the yoke structure, constituting on the whole a well balanced symmetrical form of fixture, in which the adjustable wire gripping parts are housed and largely concealed in the hollow of the cap. While the simple form of cap illustrated may be preferred, it is considered that the-shape of thisy cap may be varied and while ordinarily considered as extensions of this cap structure, the parts 2l, which engage the harp frame at separated points may be simply parts of a deep skirt extended from the body or top of the cap. Forming this member as a hollow cap, stiifens it sumciently to stand the pressure exerted `on the wire as well las constituting a housing enclosing or partly enclosing the spring tensioning means. Also, it will be appreciated that instead of having complete perforations, the lugs 24, or spaced sides of the yoke forming structure may be in the form of hooks engaging under the wire and open to permit quick sidewise .engagement of the same on the wire. y

Fig.-l illustrates what may be consideredas a modification of the first embodiment and in which the dependent holding lugs'of the cap 23a, instead of having complete circular perforations, are open at one side to form hooks 49.

-These hooks maybe faced in-opposite directions' Vas indicated' so that the cap can be engaged over the Awire with a sidewiserotary'or twisting movement. 'I'his construction has the advantage that it can be engaged over the harp after that frame has been 'bent up into its final shape, instead'of having to be mounted'onv the wire before it is Abent to the harp formation.

In Fig. l, the perforated yoke or strap r55, connecting the lower ends of the harp wire is shown as roughened, toothed or knurled at 56, where it is engaged between the base oi' the-lamp and the end of the lampsocket 51, so as in effect to form an interlocking Vclamp between the lamp base and the socket, thus to prevent turning of the socket after the parts have been set up tightly. The harp is thus made to hold the lamp socket against rotation and thus to serve-to prevent the socket turning around to vcarry the switch key or button 58, out of its desired position on the lamp.

The ilat cap form of the device illustrated has side of the wire engaged by said wire embracing the special advantage of providing a relatively wide flat base for rmly supporting larg'e size or heavier lamp shade frames. 'I'he arrangement of the spring washer 21, between the underside of the cap and a flange 26 on the lower end of the stud, as in Fig. 5, provides a desirable frictioning oi' the swivel on the so-called harpv erting yieldingv frictional holding engagement t with said frame.

2. A harp frame and a shade supporting'iixl Ature swivelled thereon and comprising a caphav-v` ing dependent oppositeiy projecting hooks en" gazed over said frame, a stud having' aA shank portion projecting up through said cap anda head portion engaged with saidframe and spring means interposedbetween said head portion and the cap for yieldinglythrusting said -head into`tv frictional holding engagement with the `harp frame. l

3. A harp frame and a shade supporting nxture-swivelled thereon,` comprising a cap having dependent lugs in swivelled engagement with said framepa stud projecting from said cap and yielding holding means confined within said cap by said harp'frame.

4. In combination, a wire harp frame, a yoke having perforated dependent lugs at opposite 'edge portions of the same embracing the wire of said harp'frameat separated points and frictionally engaging the-wire at the inner sideof the frame, a lampk shade stud projecting from the" intermediate portionA of said yoke between said dependent wire frame engaging lugs and `means for applying ayielding frictional thrust to said wire frame in line with said stud at a point intermediate and at the oppositeV outer lugs.

' KORNE'L .BERGER 

